Biomass Gasifier is a system for efficient conversion of bio-mass waste/ residue into useful inflammable gas i.e. the producer gas. The bio-waste may include agricultural residues, wood chips, straws etc. which in turn can be used to run an engine, stoves and furnace etc.A bio-mass waste/residue is fed into a Gasifier and ignited at definite range of temperature to get bio-waste convert into gas which is fed to a modified engine. This engine can be a diesel or petrol one or a gas engine.The system is especially useful in the rural areas where such wastes are in plenty, while electricity is in scarce. It consumes about 20 Kgs of dry bio-waste to run an engine of about 30HP for an hour.